Cmos Jdc P/4 Dqpsk Baseband Transmit Port

The AD7010 is a complete low power, CMOS, /4 DQPSK
Modulator with single +5 V power supply. The part is designed
to perform the baseband conversion of I and Q transmit
waveforms in accordance with the Japanese Digital Cellular
Telephone system.
The on-chip /4 Differential Quadrature Phase Shift Keying
(DQPSK) digital Modulator which includes the Root Raised
Cosine Filters generates I and Q data in response to the transmit
data stream. The AD7010 also contains ramp control envelope
Logic to shape the I and Q output waveforms when ramping up
or down at the beginning or end of a transmit burst.
Besides providing all the necessary Logic to perform /4 DQPSK
modulation, the part also provides reconstruction Filters to
smooth the DAC outputs, providing continuous time Analog
outputs. The AD7010 generates differential Analog outputs for
both the I and Q signals.
As it is a necessity for all digital mobile systems to use the lowest
possible power, the device has power down options. The
AD7010 is housed in a space efficient 24-pin SSOP (Shrink
Small Outline Package). By Analog Devices, Inc.